From: Narbik Kocharians (narbikk@gmail.com)
Date: Wed Jul 02 2008 - 18:39:46 ART
You welcome M8.
On Wed, Jul 2, 2008 at 2:37 PM, <M_A_Jones@dellteam.com> wrote:
> (crickets chirping!)
>
> Way to slam dunk this topic Naribik..You definitely clarified things!
>
> Thanks to you all!
>
>
> Michael Jones
> Network Engineer
> Global Network Operations
> Dell Inc. | J&M Consultants
> W. 512.723.3268 | C. 512.966.6908
>
>
> ------------------------------
> *From:* Narbik Kocharians [mailto:narbikk@gmail.com]
> *Sent:* Wednesday, July 02, 2008 4:15 PM
> *To:* Sharifi, Reza
> *Cc:* Jones, M A - Dell Team; ccielab@groupstudy.com
> *Subject:* Re: BGP CONFED VS ROUTE RELFLECTIES!
>
> Without going through and referencing *some old RFCs* and/or "*long
> winded explanation*" as some will call it, there are basically two
> approaches in solving the full mesh IBGP peering within an AS:
>
>
>
> - Route-reflectors
> - Confederation
>
>
>
> I think you need to tackle this from the perspective of the following
> items, here are some of the reasons you would select one over the other:
>
>
>
> *Merging new ASes:*
>
> This is definitely one of the benefits of confederation because a brand new
> AS can be merged into the confederation as a sub-as of the existing
> confederation, whereas that concept is missing from RR.
>
>
>
> *Experience:*
>
> You will probably find that there are more people that have experience
> configuring and maintaining route-reflectors versus confederation and as a
> result of that there must be more efforts on training.
>
>
>
> *Scalability:*
>
> Confederation has more scalability built in versus route-reflectors, I know
> that we can configure hierarchical route-reflection, but remember that you
> can have that within each sub-as, meaning that in confederation, within each
> sub-as you can have route-reflectors and/or even go as far as having
> hierarchical RRs .
>
> Scalability is also apparent when you look at the IGP that must run within
> a single AS and how it can reach its maximum capacity with growth and become
> unmanageable or having huge number of routes in the routing table of each
> router, whereas, in confederation, each sub-confed can have its own IGP or
> it's own version of IGP and as a result of that lesser routes in the routing
> table and etc.
>
>
>
> *Migration:*
>
> Well it must be easier to migrate to route-reflectors versus confederation,
> when you think about the sub-ases and how some of the attributes work just
> the way they are advertised and some don't, such as: next-hop, local-pref
> and MED.
>
> But you must also remember that when it comes to policy control,
> confederations have a better policy control than route-reflectors.
>
>
> On Wed, Jul 2, 2008 at 1:19 PM, Sharifi, Reza <Reza.Sharifi@gdit.com>
> wrote:
>
>> Mike,
>>
>> Take a look at this brief document.
>> It explains the differences and maybe helpful to you
>>
>> https://www.juniper.net/customers/csc/documentation/techdocs/downloads/p
>> df/350010.pdf
>>
>> Reza
>>
>> -----Original Message-----
>> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
>> M_A_Jones@DellTeam.com
>> Sent: Wednesday, July 02, 2008 3:57 PM
>> To: ccielab@groupstudy.com
>> Subject: BGP CONFED VS ROUTE RELFLECTIES!
>>
>> Can somone clarify-When to use BGP Confederations over Route Reflectors
>> (or
>> vice versa)...I have been unable to get a complete answer ???
>>
>> Experts help me out !
>>
>>
>> Michael Jones
>> Network Engineer
>> Global Network Operations
>> Dell Inc. | J&M Consultants
>> W. 512.723.3268 | C. 512.966.6908
>>
>>
>> _______________________________________________________________________
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>>
>>
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>>
>>
>>
>>
>
>
> --
> Narbik Kocharians
> CCSI#30832, CCIE# 12410 (R&S, SP, Security)
> www.Net-Workbooks.com <http://www.net-workbooks.com/>
> Sr. Technical Instructor
>
-- Narbik Kocharians CCSI#30832, CCIE# 12410 (R&S, SP, Security) www.Net-Workbooks.com Sr. Technical Instructor
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